package com.atguigu.gulimall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.TO.es.SkuEsModel;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.search.config.GulimallElasticSearchConfig;
import com.atguigu.gulimall.search.constant.EsConstant;
import com.atguigu.gulimall.search.feign.ProductFeignService;
import com.atguigu.gulimall.search.service.MallSearchService;
import com.atguigu.gulimall.search.vo.AttrResponseVo;
import com.atguigu.gulimall.search.vo.BrandVo;
import com.atguigu.gulimall.search.vo.SearchParam;
import com.atguigu.gulimall.search.vo.SearchResult;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.core.codec.EncodingException;
import org.springframework.stereotype.Service;
import org.thymeleaf.util.StringUtils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class MallSearchServiceImpl implements MallSearchService {

    @Autowired
    private RestHighLevelClient client;

    @Autowired
    ProductFeignService productFeignService;

    //es 进行检索
    @Override
    public SearchResult search(SearchParam searchParam) {
        //1、动态构建除查询需要的DSL语句
        SearchResult  result = null;

        //1、准备检索请求
        SearchRequest searchRequest  = buildSearchRequest(searchParam);
        try {
            //2、执行检索请求
            SearchResponse response = client.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);
            //3、分析相应数据封装成我们需要的格式
            result =buildSearchResult(response,searchParam);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }



    /**
     * 准备请求数据
     * #模糊匹配,过滤（按照属性，分类，品牌，价格区间，库存），排序，分页，高亮，聚合分析
     * @return
     */
    private SearchRequest buildSearchRequest(SearchParam searchParam) {
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();//构建DSL语句
        /**
         *查询：模糊匹配,过滤（按照属性，分类，品牌，价格区间，库存）
         */
        //1、构建bool - query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1、must-模糊匹配,
        if(!StringUtils.isEmpty(searchParam.getKeyword())){
            boolQuery.must(QueryBuilders.matchQuery("skuTitle",searchParam.getKeyword()));
        }
        //1.2、bool - filter - 按照三级分类的id查询
        if(searchParam.getCatalog3Id() != null){
            boolQuery.filter(QueryBuilders.termQuery("catalogId",searchParam.getCatalog3Id()));
        }
        //1.2、bool - filter - 按照品牌id查询
        if(searchParam.getBrandId() != null && searchParam.getBrandId().size()>0){
            boolQuery.filter(QueryBuilders.termsQuery("brandId",searchParam.getBrandId()));
        }
        //1.2、bool - filter - 按照所有的指定的属性进行查询
        if(searchParam.getAttrs() != null && searchParam.getAttrs().size()>0){


            for(String attrStr : searchParam.getAttrs()){
                //attrs=1_5寸:8寸&attrs=2_16G:8G
                BoolQueryBuilder nestedboolQuery = QueryBuilders.boolQuery();
                //attr = 1_5寸:8寸
                String[] s = attrStr.split("_");
                String attrId = s[0]; //检索的属性id
                String[] attrValues = s[1].split(":"); //这个属性的检索用的值
                nestedboolQuery.must(QueryBuilders.termsQuery("attrs.attrId",attrId));
                nestedboolQuery.must(QueryBuilders.termsQuery("attrs.attrValue",attrValues));
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs",nestedboolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }

        }
        //1.2、bool - filter - 按照库存是否有进行查询
        if(searchParam.getHasStock() != null){
            boolQuery.filter(QueryBuilders.termQuery("hasStock",searchParam.getHasStock() == 1 ? true : false));
        }

        //1.2、bool - filter - 按照价格区间
        if(!StringUtils.isEmpty(searchParam.getSkuPrice())){
            //1_500/_500/500_
            /**
             * "range": {
             *     "skuPrice": {
             *         "gte": 0,
             *         "lte": 6000
             *     }
             * }
             */
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");

            String[] s = searchParam.getSkuPrice().split("_");

            if(s.length == 2){
                //区间
                rangeQuery.gte(s[0]).lte(s[1]);
            }else if(s.length == 1){
                if(searchParam.getSkuPrice().startsWith("_")){
                    rangeQuery.lte(s[0]);
                }
                if(searchParam.getSkuPrice().endsWith("_")){
                    rangeQuery.gte(s[0]);
                }
            }

            boolQuery.filter(rangeQuery);
        }

        searchSourceBuilder.query(boolQuery);
        /**
         *排序,分页,高亮
         */
        //2.1、排序
        if(!StringUtils.isEmpty(searchParam.getSort())){
            String sort = searchParam.getSort();
            //sort=hotScore_asc/desc
            String[] s = sort.split("_");
            SortOrder order= s[1].equalsIgnoreCase("asc")? SortOrder.ASC:SortOrder.DESC;
            searchSourceBuilder.sort(s[0],order);
        }
        //2.2、分页
        searchSourceBuilder.from((searchParam.getPageNum()-1)*EsConstant.PRODUCT_PAGESIZE);
        searchSourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);

        //2.3、高亮
        if(!StringUtils.isEmpty(searchParam.getKeyword())){
            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");
            searchSourceBuilder.highlighter(builder);
        }
        /**
         * 聚合分析
         */
        //1. 按照品牌进行聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);
        //1.1 品牌的子聚合-品牌名聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        //1.2 品牌的子聚合-品牌的图片聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        searchSourceBuilder.aggregation(brand_agg);

        //2 按照分类信息进行聚合
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg");
        catalog_agg.field("catalogId").size(20);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        searchSourceBuilder.aggregation(catalog_agg);

        //3.按照属性信息进行聚合
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg","attrs");
        //3.1按照属性ID进行聚合
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        attr_agg.subAggregation(attr_id_agg);
        //3.1.1 在每个属性Id下,按照属性名进行聚合
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        //3.1.1 在每个属性Id下,按照属性值进行聚合
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        searchSourceBuilder.aggregation(attr_agg);

        String s = searchSourceBuilder.toString();
        System.out.println("构建的DSL"+ s);
        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX},searchSourceBuilder);
        return searchRequest;
    }

    /**
     * 构建结果数据
     * @param response
     * @return
     */
    private SearchResult   buildSearchResult (SearchResponse response,SearchParam searchParam) {
        SearchResult result = new SearchResult();
        //1、返回的所有的查询到的商品
        SearchHits hits = response.getHits();

        List<SkuEsModel> esModels = new ArrayList<>();
        //遍历所有商品信息
        if(hits.getHits() != null && hits.getHits().length > 0){
            for(SearchHit hit:hits.getHits()){
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel esModel = JSON.parseObject(sourceAsString,SkuEsModel.class);
                //判断是否按关键字检索，若是就显示高亮,否则不显示
                if(!StringUtils.isEmpty(searchParam.getKeyword())){
                    //拿到高亮信息显示标题
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String skuTitleValue = skuTitle.getFragments()[0].string();
                    esModel.setSkuTitle(skuTitleValue);
                }
                esModels.add(esModel);

            }
        }
        result.setProducts(esModels);

        //2、当前商品涉及到的所有属性信息
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        //获取属性信息的聚合
        ParsedNested attrsAgg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attrIdAgg = attrsAgg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attrIdAgg.getBuckets()){
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            //1、得到属性的id
            long attrId = bucket.getKeyAsNumber().longValue();
            attrVo.setAttrId(attrId);

            //2、得到属性的名字
            ParsedStringTerms attrNameAgg = bucket.getAggregations().get("attr_name_agg");
            String attrName = attrNameAgg.getBuckets().get(0).getKeyAsString();
            attrVo.setAttrName(attrName);
            //3、得到属性的所有值
            ParsedStringTerms attrValueAgg = bucket.getAggregations().get("attr_value_agg");
            List<String> attrValues = attrValueAgg.getBuckets().stream().map(item -> item.getKeyAsString()).collect(Collectors.toList());
            attrVo.setAttrValue(attrValues);
            attrVo.setAttrName(attrName);
            attrVo.setAttrId(attrId);

            attrVos.add(attrVo);
        }
        result.setAttrs(attrVos);
        //3、当前商品涉及到的所有品牌信息
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        //获取到品牌的聚合
        ParsedLongTerms brandAgg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket: brandAgg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            //1、得到品牌的id
            long brandId = bucket.getKeyAsNumber().longValue();
            brandVo.setBrandId(brandId);
            //2、得到的品牌的名字
            ParsedStringTerms brandNameAgg = bucket.getAggregations().get("brand_name_agg");
            String brandName = brandNameAgg.getBuckets().get(0).getKeyAsString();
            brandVo.setBrandName(brandName);
            //3、得到品牌的图片
            ParsedStringTerms brandImgAgg = bucket.getAggregations().get("brand_img_agg");
            String brandImg = brandImgAgg.getBuckets().get(0).getKeyAsString();
            brandVo.setBrandImg(brandImg);
            brandVos.add(brandVo);

        }
        result.setBrands(brandVos);

        //4、当前商品涉及到的所有分类信息
        //获取分类的聚合
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        ParsedLongTerms catalogAgg = response.getAggregations().get("catalog_agg");
        for(Terms.Bucket bucket : catalogAgg.getBuckets()){
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            //得到分类id
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));
            //得到分类名
            ParsedStringTerms catalogNameAgg = bucket.getAggregations().get("catalog_name_agg");
            String catalogName = catalogNameAgg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalogName);
            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);

        //遍历所有的商品信息
        //===============以上可以从聚合信息中获取===================//
        //5、分页信息-页码
        result.setPageNum(searchParam.getPageNum());
        //5、1分页信息、总记录数
        long total = hits.getTotalHits().value;
        result.setTotal(total);
        //5、 2分页信息-总页码-计算
        int totalPages = (int)total % EsConstant.PRODUCT_PAGESIZE == 0 ?
                (int)total / EsConstant.PRODUCT_PAGESIZE : ((int)total / EsConstant.PRODUCT_PAGESIZE + 1);
        result.setTotalPages(totalPages);
        List<Integer> pageNavs = new ArrayList<>();
        for(int i = 1; i<= totalPages;i++){
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

        // TODO 6、构建面包屑导航
        if(searchParam.getAttrs() != null && searchParam.getAttrs().size() > 0){
            List<SearchResult.NavVo> collect = searchParam.getAttrs().stream().map(attr -> {
                //1、分析每一个attrs传过来的参数值
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                String[] s =attr.split("_");
                navVo.setNavValue(s[1]);
                R r = productFeignService.attrInfo(Long.parseLong(s[0]));
                result.getAttrIds().add(Long.parseLong(s[0]));
                if(r.getCode() == 0){
                    AttrResponseVo data = (AttrResponseVo) r.getData("attr",new TypeReference<AttrResponseVo>(){});
                    navVo.setNavName(data.getAttrName());
                }else{
                    navVo.setNavName(s[0]);
                }
                //2、取消了这个面包屑以后,将请求地址的url里面的当前置空
                //拿到所有的查询条件,去掉当前
                String replace = replaceQueryString(searchParam, attr,"attrs");
                navVo.setLink("http://search.gulimall.com/list.html?"+replace);
                return navVo;

            }).collect(Collectors.toList());
            result.setNavs(collect);
        }
        //品牌，分类
        if(searchParam.getBrandId()!= null && searchParam.getBrandId().size()> 0){
            List<SearchResult.NavVo> navs = result.getNavs();
            SearchResult.NavVo navVo = new SearchResult.NavVo();
            navVo.setNavName("品牌");
            //TODO 远程查询所有品牌
            R r = productFeignService.brandsInfo(searchParam.getBrandId());
            if(r.getCode() == 0){
               List<BrandVo> brand = (List<BrandVo>) r.getData("brand",new TypeReference<List<BrandVo>>(){});
               StringBuffer buffer = new StringBuffer();
               String replace = "";
               for (BrandVo brandVo:brand) {
                    buffer.append(brandVo.getBrandName()+";");
                    replace = replaceQueryString(searchParam,brandVo.getBrandId()+"","brandId");
                }
               navVo.setNavValue(buffer.toString());
               navVo.setLink("http://search.gulimall.com/list.html?"+replace);
            }
            navs.add(navVo);
        }

        return result;
    }

    private String replaceQueryString(SearchParam searchParam, String value,String key) {
        String encode = null;
        try {
             encode = URLEncoder.encode(value,"UTF-8");
            encode = encode.replace("+","%20"); //浏览器对空格编码和java不一样
        } catch (Exception e) {
            e.printStackTrace();
        }
        return searchParam.get_queryString().replace("&"+key+"="+encode,"");
    }
}
